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DS: Fachverband Dünne Schichten

DS 5: 2D Materials and their Heterostructures II: Graphene and Graphene Containing Heterostructures

DS 5.9: Talk

Tuesday, March 19, 2024, 11:45–12:00, A 053

Giant asymmetric proximity-induced spin-orbit coupling in twisted graphene/SnTe heterostructure — •Marko Milivojević^1,2,3, Martin Gmitra^4,5, Marcin Kurpas⁶, Ivan Štich¹, and Jaroslav Fabian² — ¹Institute of Informatics, Slovak Academy of Sciences, Bratislava, Slovakia — ²Institute for Theoretical Physics, University of Regensburg, Regensburg, Germany — ³Faculty of Physics, University of Belgrade, Belgrade, Serbia — ⁴Institute of Physics, Pavol Jozef Šafárik University in Košice, Košice, Slovakia — ⁵Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia — ⁶Institute of Physics, University of Silesia in Katowice, Chorzow, Poland

We analyze the spin-orbit coupling effects in a twisted graphene/SnTe heterostructure. and show that incompatible mutual symmetry of the twisted monolayers and a strong hybridization have a massive impact on the spin splitting in graphene close to the Dirac point, with the spin splitting values bigger than 20 meV. Strong hybridization of the Dirac cone’s right movers with the SnTe band gives rise to a large asymmetric spin splitting, whereas the ferroelectricity-induced Rashba spin-orbit coupling in graphene represents the dominant contribution to the overall Rashba field, with the effective in-plane electric field that is almost aligned with the ferroelectricity direction of the SnTe monolayer. We also predict an anisotropy of the in-plane spin relaxation rates. This project has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under the Programme SASPRO 2 COFUND Marie Sklodowska-Curie grant agreement No. 945478.

Keywords: graphene; proximity effects; spintronic; spin-orbit